diff --git a/docs/build.gradle b/docs/build.gradle
index bd36036b9a2e0480029b9570e2ca489e5166848f..7553b8731fdbc81304144ce3f4301e9781edad96 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -37,8 +37,10 @@ task docs(type: Exec, dependsOn: [copySphinxConf, javadoc]) {
   commandLine 'make', 'html'
 }
 
-task clean << {
-  ant.delete dir: 'build'
-  ant.delete file: 'src/main/sphinx/conf.py'
+task clean {
+  doLast {
+    ant.delete dir: 'build'
+    ant.delete file: 'src/main/sphinx/conf.py'
+  }
 }